This study aimed to evaluate the durability and mechanical properties of two different woood species, namely beech (Fagus sp.) and silver fir (Abies alba), from Bosnia and Herzegovina thermally modified at three different temperatures and duration at maximum temperature. Samples of the mentioned wood species wood (Abies alba) were prepared according to EN 408+A1 standard. The maximum 4-point bending force, modulus of elasticity in bending, tensile force, compression strength parallel to the grain, compression strength perpendicular to the grain in modified and unmodified samples, before and after twelve months in different exploitation conditions, were determined. Results indicated that mechanical properties are the function of temperature and modification duration. Samples tested in laboratory conditions show better mechanical properties than the causes that were field exposed.

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